Notebook wireless switch failure.

I found I cannot switch on the wireless radio today. It turns out to be the result of accidentally deleting of HP Wireless Assistant software (which I though useless) several days ago. Furthermore, I found that the hardware switch on the keyboard should be first turned on, then one could turn on/off the wireless in HP Wireless Assistant. Thus, it's a good idea to always keep the hardware radio switch on and use the software switch to enable or disable the wireless signal.